<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .p{
      background: cadetblue;
      width: 280px;
      height: 160px;
      font-size: 18px;
      font-weight: normal;
      font-style: italic;
      text-align: center;
      line-height: 160px;
    }
  </style>
</head>
<body>
  <p class="p">
    让该段文字居中
  </p>
</body>
</html>